ANOVAs

For more complex hypotheses, we'll have to go to ANOVAs. As a pretty artifical
example, we'll combine the test performed in the t-test example with another
test in a simple ANOVA using aov(), asking if case
and educationand their interaction have any association
with age.

We're getting pretty much the same answers, except that the variance has been
partitioned appropriately for looking at the more complex question.
anova() produces the ANOVA table from the output of
aov().

For a much more detailed treatment of ANOVAs and other methods, get the
VR package or Notes on the use of R..."
in the Contributed documentation page.